<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="/assets/lib/cropper/cropper.css">
  <style>
    .container {
      width: 600px;
      height: 500px;
      float: left;
    }

    .w200 {
      width: 200px;
      height: 200px;
    }

    .w100 {
      width: 100px;
      height: 100px;
    }

    .w50 {
      width: 50px;
      height: 50px;
    }

    .w30 {
      width: 30px;
      height: 30px;
    }

    .preview {
      background-color: #ccc;
      margin: 10px;
      /* 预览的图片溢出部分隐藏 */
      overflow: hidden;
    }
  </style>
</head>

<body>
  <div class="container">
    <img src="/assets/images/sample2.jpg">
  </div>
  <!-- 预览区域结构 -->
  <div class="preview_box">
    <div class="preview w200"></div>
    <div class="preview w100"></div>
    <div class="preview w50"></div>
    <div class="preview w30"></div>
  </div>

  <input type="file" id="file" style="display: none;" accept="image/jpeg,image/png,image/bmp,image/gif" />

  <button class="layui-btn" id="btnChooseImage">上传</button>





  <script src="/assets/lib/jquery.js"></script>
  <script src="/assets/lib/cropper/Cropper.js"></script>
  <script src="/assets/lib/cropper/jquery-cropper.js"></script>
  <script>
    // 1.1 获取裁剪区域的 DOM 元素

    let $image = $(".container img");

    // 1.2 配置选项
    $image.cropper({
      // 纵横比
      aspectRatio: 1,
      preview: ".preview",
    })

    // 1.3 创建裁剪区域
    $image.cropper(options);
    $('#btnChooseImage').click(function () {
      $('#file').click();
    });
  </script>
</body>

</html>